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Pure substances and mixtures
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4.1. Pure substances and mixtures Pure substances are substances made up of a single type of element or compound. Two examples of pure substances are iron and salt. A mixture is made up of different…
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Changes in matter
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6.1. Changes in matter Matter is not immutable, as both the form it adopts and its composition can change. Physical changes A physical change takes place when the nature of matter is unchanged, this is…
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Answer. The world's rivers and lakes
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Find the names of the rivers that the following sentences refer to: It has the highest flow of any river on Earth: It is the river with the largest volume of water in Africa: It has the highest flow of…
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Everyday life in Athens
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4.1. Everyday life in Athens Like most Greek cities, Athens was surrounded by walls and had narrow streets. There were no sewers, water was scarce and no one collected the rubbish. The streets were full…
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Check. Test yourself
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Remember what you have studied in this unit and answer the questions: Are average velocity and instantaneous velocity the same? When? Why? What effects do forces produce? Give several examples of these…
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Arable farming
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What is arable farming? Arable farming is the cultivation of land to grow food like fruit, vegetables and cereals, and other products like cotton. A person who works in arable farming is called an…
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Introduction - Heat and temperature
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Heat or thermal energy is the energy that a body transfers to a colder body at a certain temperature. Thermal energy is involved in many processes in our daily life, like cooking food, making a hot…
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Pure substances: elements and compounds
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3.1. Pure substances and mixtures Pure substances are substances which have a fixed composition and properties which allow us to identify them. Mixtures are made up of two or more pure substances. 3.2.…
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Rock types
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Sedimentary rocks Common salt is made when sea water evaporates. It is extracted from salt mines. Sandstone is a sedimentary rock made up of grains of sand that are held together by other mineral…
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